Abstract
Apoptosis signal-regulating kinase 1 (ASK1) is a serine/threonine kinase that mediates cell stress signaling initiated by diverse stimuli, such as H2O2 and TNFα. Owing to its critical role in promoting apoptosis, ASK1 activity is highly controlled in cells. Phosphorylation of ASK1 at Thr-845 has been correlated with its activation, while phosphorylation at Ser-967 negatively controls its death promoting activity. Here, we report the identification of a novel phosphorylation site at Ser-1034 in the C-terminal regulatory domain of ASK1. Mutating Ser-1034 to an unphosphorylatable Ala led to increased catalytic activity of ASK1 and enhanced proapoptotic function of ASK1. Thus, the proapoptotic function of ASK1 is suppressed in part by phosphorylation at its C-terminal regulatory domain, which may couple upstream survival kinases to the death regulatory machinery.
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Abbreviations
- ASK1:
-
Apoptosis signal-regulating kinase 1
- HA:
-
hemagglutinin
- IP:
-
immunoprecipitate
- JNK/SAPK:
-
c-Jun N-terminal kinase/stress-activated protein kinase
- MAPK:
-
mitogen-activated protein kinase
- PMSF:
-
phenylmethylsulfonyl fluoride
- TNF:
-
tumor necrosis factor
- TRAF:
-
TNF receptor-associated factor
- WT:
-
wild type
- DAPI:
-
4′,6-diamidino-2-phenylindole
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Acknowledgements
We thank members of the Fu lab for helpful discussions, Lisa Montoya Cockrell for assistance in manuscript preparation, and Dr Bill Lane of Harvard Microchemistry facility for phosphopeptide sequence analysis. This work was supported in part by grants from American Heart Association (9950226N) and NIH/National Institute of General Medical Sciences (GM60033 and GM53165).
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Fujii, K., Goldman, E., Park, H. et al. Negative control of apoptosis signal-regulating kinase 1 through phosphorylation of Ser-1034. Oncogene 23, 5099–5104 (2004). https://doi.org/10.1038/sj.onc.1207668
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DOI: https://doi.org/10.1038/sj.onc.1207668
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